21301193 has 2 divisors, whose sum is σ = 21301194. Its totient is φ = 21301192.

The previous prime is 21301157. The next prime is 21301201. The reversal of 21301193 is 39110312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18731584 + 2569609 = 4328^2 + 1603^2 .

It is a cyclic number.

It is not a de Polignac number, because 21301193 - 2¹⁶ = 21235657 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (21306193) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10650596 + 10650597.

It is an arithmetic number, because the mean of its divisors is an integer number (10650597).

Almost surely, 2^21301193 is an apocalyptic number.

It is an amenable number.

21301193 is a deficient number, since it is larger than the sum of its proper divisors (1).

21301193 is an equidigital number, since it uses as much as digits as its factorization.

21301193 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 162, while the sum is 20.

The square root of 21301193 is about 4615.3215489281. The cubic root of 21301193 is about 277.2051593456.

The spelling of 21301193 in words is "twenty-one million, three hundred one thousand, one hundred ninety-three".